Smelting-furnace.



C KDAvas. SMELUNG FURNAC. .APPLCATlO FILED AUG. 14. IQI'S. v 1,165,393, 'Patented Dec. 28, 191:1

3 SHEETS--SHEEI' l.

wocmtoz A @www5 mm. a

C. K. DAVIS.

SMELTENG FURNACE.

AM'MCAHON mm we u :91a

1,165,393. .Patented Dec. 28, 1915.

3 SHEETS-SHEET 2.

M vento@ c. K. DAVIS.

SMELTING FURNACE.

APPLICATION FILED AuGy I4, I9I5.

Patented Dec. 28, 1915.

3 SHEETSASHEET 3.

proved deviee.

U Ngir'in) sir-.eras Pier-ENT (Hirten.

CHARLES K. DAVIS. OF DETROIT. MICHGAN.

SMELTING-FURNACEL Speciczition of Letters Patent.

latenleilhee. 25,1913.

Application filed August 14. l9l5, 'Selial No, 45.48l.

This invention i'elalesito the i'eiliii'tion el'. iron ore. :nui i15- olrieet is. to pror'iile :imple show the valve therein..- z Fig.- f ir af'i'er'tieal :section ofthesmeltingl fnrnaee on a'iilane pasing throiigh the heater for the airhlast. Similar .referenee ehai'aeter.' ii-fei". .tohke 'liarts tlii' iii";glioiit the several views.

'flu-,various parts of. the plant deze toei.i'iho l \"ihe*piment invention ar 'voni'entionallyT the invention rf.;-.i.lin ;r in

con'ihining r these parts in a new ai :intl nm in the details of eointrnetioh. the rota-r)l kiln and the fuel feedingr lt-vieze therefore may .he the' same as those now lining employed in burningr eeinent elinkei; the :anelit- *ing fiirnaee may he sin'i'ilar in eonzwtrlir-iion The usual tootlieflflrii'ing ring! :3 may he. en

toitliose no` in useV although on a milch smaller seale. while an well known means inay he employed toutilize the heat of the waste ga: to {ire-heat the airhlats.

The rotary kiln l is provided will: an)l .lel Sireil nurnher of supportinga-ings L'. \\'hieh rest. on rollers 3 carried h i' the sniii'ioi'..-. Vl..

ggeil h iv the driving pinion (3. The lining 'i of the kiln will depend upon the charm-ter of the ore to be treated. As shown in Figs. 3 and l, the upper or charging enrl of the kiln extends into a pocket in the is'all S of a (lue 9 that connects with a chimney 10 pro- -lto the sinelting liii'iiaee through a pas;

angler-ation of this imi:f

-hea generated h 'v the omini-s1 n \`ileil with a lampe-i' or lnitterllv- 'val-ve ll.

ln the top l2 ol' this lne isfa @hanging ehiite 13', hy mean of whieh ore aml limestone may he fell to the kiln.

` blower .ll hires a lilast'of'air-tln'ongli Ythe. eoil l5 loeatetl in the lhie in the path of the. hot gases that are passing-'from the rota|' kiln lo the chimney l0. iinfl thiot'igh the liipe 1G that extends from the eoil, to the. iliseharr'e einl-of the kiln. rl"l|i. (lirxhal'ge enil is, :ali'i'rmnnleil'h i' a euirl li' from iiliirh the hi-ateil ore anil lliixing'material parex's mljllt per g\ im' eolieT eoal or ehai'eoal iS-iiioii'ijitetlfj erahly water-j:ieketeil.-' From-"tl iniinieation lafhreeii the :furnace ainl, ithe )fine ."o nlm a ralre 'I'.' may heinfiiiiit` wl lietireeii the hlowei' l-l 21ml (he (oil`1..

Ylinore ain'l limi-.stone ari,l lei-l into thikiln through the finite lil. and; the inelinalioii ol' the kiln. t moi-es. lowaill the sineliinj; kiln revolves. heizig expo-wil [o lli.

fili-l thai is low-wl in thi'niigfh the The |1res i|re within the kiln nezii' the A charge elisite l-"' l'g'htli' :gi-eater than at the lower enfl of thi:`v pas` l.. -to that the 'afes in the l'nz'naee ill not ilitfa the kiln. 'l`hi -A pressuriiii the kilninai he regulated hv mean,- ilihe hiiierllr .'aize ll. nml hj' the \:il\'\ 'ifv. \\`hiie the liiiSSill'e in the fnrnaee mai' he regulated l. the valvesl 3H and The molten hon mai' he taii'ied ofil at the spout 37 and the slag at the spout 38.

By supplying fresh air and fuel to the rotary kilnl the ore and limestone. are brought to a very high temperature at a very low fuel cost in comparison to the cost-of the fuel burned in the usual smelting furlVhen the ore and limestone finally arrive at the lower end of the rotary kiln, they are met by what is substantially a redueing flame, and the conversion of the ore to metallic iron is imminent. Instead of being exposed when at this` very high temperature to the gases from the smeltiner furnace, which gases are often loaded with sulfur and phosphorus, the ore in the present rotary kiln is roasted in such a manner that if it contains a high percentage of sulfur`v this is driven off to a large extent.

The Ore and limestone pass from the kiln tothe furnace at avery high ten'iperature. one at which the silica in the ore and the limestone are about to combine. ore falls into the furnace, it, is about ready to combine with the carbon of the fuel so that this reduction is substantially inunedi Y same capacity where the ore is heated in the furnace. The actual loss in heat units from the furnace will therefore be much less than with the present types of furnaces, and the.

tot-a'l amount of' carbon required to reduce the ore is less than that required in the presA ent systems where the coke, ore and lime stone are vfed into the top Aof the sinelting furnace.

The large percentage of as h in the coke required to heat the ore and limestone in the ordinary furnace remains in the furnace and must be carried out by the slag. thus increasingY the amount of limestone required. In the present construction, none. of this ash is mixed with the ore. for even when powdered coal is used in the rotarv kiln` the ash will be carried along by the blast and be deposited in the. flue Sor be carried up the chimney l0.

\'Vhen this i I claim 1. The combination with a rotary kiln, means to charge the kiln at its upper end, means to introduce fuel at the opposite end, a smeltingr furnace, a conduit to convey the heated contents of the kiln to the furnace and a passage independent of the kiln to eonvev away the burnt gases from the snielting furnace. i i

The combix'iation of a rotary kiln, means to charge the kiln at its upper end, in lans to intro-duce fucl and air under pressure at the opposite discharge end. means to control the pressurtl o f air within the kiln` a smelting furnace. means to convey the. heated contents of the kiln to the `furnace and a passage independent of the kiln to convey away the burnt gases from the smclting furnace.

3. The combination of an inclined rotary kiln, means to convey away the burnt gases from the upper end of said kiln, an air pipe so mounted that the air passing through it will be heated by such gases, means to charge 'the kiln at its upper end, means to introducrl fuelland'heatcd air under pres sure into the lower end of the. kiln` a smeltingr furnace. and means to convey the heated contents of the kiln to the furnace` the pressure within the kiln being sufiicient to prevent thc passage of gases from the furnace, to the kiln.

l. The combination of an inclined rotary kiln, means to convey away the burnt gases from the. upper end .of said kiln` an air pipe so mounted that the lair passing' through it will be heated by such gases. means to charge the kiln at its upper end, means to introduce fuel and heated air under pres sure into the lower end of the kiln` a smeltin;r furnace. means to convey the heated contents ofthe kiln to the furnace, and means to prevent the passage of gases from the furnace to the kiln.

ln testimony whereof have signed this specification.

Acli-matics K. Davis. 

